DE1517473A1 - Process for removing scale and preventing scale formation - Google Patents
Process for removing scale and preventing scale formationInfo
- Publication number
- DE1517473A1 DE1517473A1 DE19651517473 DE1517473A DE1517473A1 DE 1517473 A1 DE1517473 A1 DE 1517473A1 DE 19651517473 DE19651517473 DE 19651517473 DE 1517473 A DE1517473 A DE 1517473A DE 1517473 A1 DE1517473 A1 DE 1517473A1
- Authority
- DE
- Germany
- Prior art keywords
- scale
- water
- salt
- boiler
- formation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/12—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
- C23F11/14—Nitrogen-containing compounds
- C23F11/144—Aminocarboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G3/00—Rotary appliances
- F28G3/16—Rotary appliances using jets of fluid for removing debris
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Metallurgy (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
"Verfahren zur Entfernung von Kesselstein und Verhütung von Kesselsteinbildung" Die Erfindung betrifft ein Verfahren zur Verringerung und Entfernung von Kesselsteinbildunü in Dampfkesseln, und sie bezieht sich insbesondere auf ein Verfahren zur Verhütung und Entfernung von Kesselstein in Verdampfapparaten, Speisewassererhitzern, Vorwärmern, Boilern und anderen Teilen von Dampferzeugeranlagen."Process for removing scale and preventing scale formation" The invention relates to a method for reducing and removing scale formation in steam boilers, and it relates in particular to a method of prevention and removal of scale in evaporators, feed water heaters, preheaters, Boilers and other parts of steam generator systems.
Ein lästiges Problem, das bei Dampfkesseln auftritt, in denen zur Dampferzeugung Wasser bei überatmosphärischen Drucken gekocht wird, ist die Neigung der im Wasser vorhandenen harten Bestandteilen, sich an den Wärmeaustauschoberflächen in Form von Kesselstein abzusetzen. Diese Kesselsteinablagerun" vermindert die Wärmeübertragung über die därmeaustauschflächen, wobei die Gefahr des Überhitzens des Metalles vergrössert wird. Eines der ernsthaftesten Ergebnisse, das durch diese hesselsteinablagerung zu befürchten ist, ist das Reissen der Wärmeaustauschoberflächen des r.essels.An annoying problem that occurs with steam boilers in which the Steam generation Water is boiled at superatmospheric pressures is the propensity those present in the water hard components to adhere to the heat exchange surfaces settle in the form of scale. This scale build-up reduces the heat transfer over the intestinal exchange surfaces, which increases the risk of overheating of the metal will. One of the most serious results from this scale build-up What is to be feared is the cracking of the heat exchange surfaces of the r.essel.
Es wurde bereits eine Vielzahl von Stoffen vorgeschlagan, um den Kesselstein zu entfernen und insbesondere die Bildung desselben zu verhindern. Stoffe wie fannin, modifizierte Lignine, Algine und andere organische Substanzen von relativ komplexer liolekularkonfiguration wurden verwendet. l,bwohl diese Stoffe brauchbar sind, haben sie einen oder mehrere Nachteile. So kann beispielsweise ihre Anwendung Oxydation des Kessels, Zersetzung der Metalloberfläche und unerwünschte Färbung hervorrufen, wo-bei durch Mitreissen Dampfverunreinigungen auftreten können. In manchen Fällen müssen solche bekannte Kesseladditive in grossen Mengen zugesetzt werden, um tatsächlich Kesselsteinbildung zu verhüten. In anderen Situationen werden nur bestimmte Kesselsteinarten durch übliche organische Additive angegriffen. Es wäre daher ein technischer Fortschritt, wenn eine Behandlung von Kesselstein ermöglicht würde, bei der viele der genannten Nachteile ausgeschaltet würden und insbesondere in geringen Mengen wirksam wären. Ausserdem würden die Interessenten ein Behandlungsverfahren sehr begrüssen, mit dem es mÖglich wäre, die Bildung einer grossen Vielzahl von Kesselsteinarten zu verhüten und/oder diese zu entfernen. Es ist daher Aufgabe der Erfindung, ein neues Verfahren zu schaffen, mit dem es möglich ist, Kesselstein zu entfernen und dessen Bildung in den Kesseln zu verhindern. Entsprechend gehört es auch zu der Aufgabe der Erfindung, eine neue Klasse von Verbindungen aufzuzeigen, die Kesselsteinbildung verhüten und zur Behandlung einer grossen Vielzahl verschiedener Kesselsteinbildner geeignet sind. , Andere Aufgaben werden aus der folgenden Beschreibung ersichtlich.A variety of substances have already been proposed to remove the scale and, in particular, to prevent it from forming. Substances such as fannin, modified lignins, algins and other organic substances of relatively complex liolecular configuration were used. While these materials are useful, they have one or more disadvantages. Thus, for example, bring about oxidation of the boiler, degradation of the metal surface and undesirable coloration their application, WO-in by entraining vapor impurities may occur. In some cases, such known boiler additives have to be added in large quantities in order to actually prevent scale formation. In other situations only certain types of scale are attacked by common organic additives. It would therefore be a technical advance if it were possible to treat scale in which many of the disadvantages mentioned were eliminated and, in particular, would be effective in small quantities. In addition, those interested would very much appreciate a treatment method that would make it possible to prevent and / or remove the formation of a wide variety of scale types. It is therefore the object of the invention to provide a new method with which it is possible to remove scale and prevent its formation in the kettles. Accordingly, it is also part of the object of the invention to provide a new class of compounds which prevent scale formation and which are suitable for the treatment of a wide variety of different scale formers. Other tasks will be apparent from the description below.
Es wurde gefunden, dass Salze der Nitrilotricarboxylsäuren zur Entfernung
und Verhütung von Kesselstei.nbildung in Kesseln wirksam sind, bei denen Dampf unter
Drucken erzeugt wird, die im Bereich von etwa 15 psi bis etwa 1100 psi liegen. Im
weitesten Sinn der Erfindung wird ausreichend Salz dem Kesselwasser zugesetzt, um
die Entfernung und Verhütung von unerwünschten Kessel®teinmengen durchzuführen.
In manchen Fällen kann ein alkalischer Stoff, wie beispielsweise Ätznatron, Natriumcarbonat oder ein Alkaliphosphat nötig sein, um das Kesselwasser auf den gewünschten pH-Bereich einzustellen.In some cases, an alkaline substance, such as caustic soda, Sodium carbonate or an alkali phosphate may be needed to add the boiler water to the set the desired pH range.
Wie bereits erwähnt, ist ein besonders bevorzugtes Additiv das Trinatriumsalz der Nitrilotriessigsäure, und zwar wegen seiner geringen Kosten, der ausgezeichneten Wirksamkeit und der Verfügbarkeit. Aber es können natürlich irgendwelche anderen Alkalimetallsalze, wie Lithium- und Kaliumsalze als kationischer Bestandteil der Salzadditive verwendet werden.As already mentioned, a particularly preferred additive is the trisodium salt of nitrilotriacetic acid, because of its low cost, the excellent Effectiveness and availability. But of course anyone else can Alkali metal salts such as lithium and potassium salts as a cationic component of the Salt additives can be used.
Die erfindungsgemässen Behandlungsmittel für den Kessel können für
jeden kesselsteinbildenden Stoff, wie Galcium-und Magnesiumphosphate, -carbonate,
-silikate u,dgl. eingesetzt werden. Ausserdem wird bei der Verwendung der Salzverbindungen
gemäss der Erfindung auch die Anhäufung
Der gleiche Versuch wurde mit xDTE-Na 4 (Äthylendiamintetraessigsäure-Na4)
durchgeführt. Diese Verbindung war innerhalb der Druckbereiche gemäss der Erfindung
in ihrer Wirkung überraschend schlechter als das NTE-Na 3. So zeigte sie bei einem
Druck von 250 psi auch in einer dreimal grösseren Menge (54 T/M ÄDTE-Na 4) gegenüber
dem NTE-Na 3 nur eine 80 %--ige Kesselsteinverhütung.
Beispiel
2
In einer anderen Versuchsserie wurde die Wirkung
der
erfindungsgemässen Salze hinsichtlich der Verhütung von
Magnesiumphosphat-Kesselsteinbildung
untersucht. Es
wurde das oben beschriebene Verfahren angewandt,
mit
Ausnahme der Speisewasserherstellung. Dieses enthielt
10
T/M Mg und 3,0 T/M überschüssiges P04. Diese Versu-
che wurden
bei einem Druck von 800 psi durchgeführt. Die Ergebnisse waren
wie folgt:
Beispiel 4 In dieser Versuchsserie wurde die Wirksamkeit des NTE-Na 3 hinsichtlich der Verhütung von Eisenoxydablagerung bei einem Druck von 400 psi untersucht. Das Zusatzwasser enthielt 5 T/M Eisen als Fe und 3,0 T/M überschüssiges P04. Mit einer Menge von 12 T/M an NTE-Na 3 wurde eine Kesselsteinverhütung von 85 96 und mit einer Menge von 18 T/M von 90 iö erzielt. Example 4 In this series of tests, the effectiveness of the NTE-Na 3 in terms of preventing iron oxide deposition was investigated at a pressure of 400 psi. The make-up water contained 5 T / M iron as Fe and 3.0 T / M excess PO4. With an amount of 12 T / M of NTE-Na 3 a scale prevention of 85 96 and with an amount of 18 T / M of 90 IO was achieved.
Beispiel 5 In einer überraschenden Serie von Versuchen wurde die Wirkung der Abweichung des Wärmeleitgrades in Bezug auf die Wirkungen von NTE-Na 3 sowie ÄDTE-Na4 ermittelt. Das Zusatzwasser war verdünntes Chicagoer Leitungswasser, das 5 T/M Ca und 2 T/M Mg enthielt, das einem Druck von 800 psi gemäss dem obenbeschriebenen Versuch unterworfen wurde. Sowohl bei 7 560 kcal 9,29 dm2/Stunde (30 000 BTU sq.ft./hr) als auch bei 22 680 kcal 9,29 dm2/Stunde (90 000 BTU sq.ft./hr) (Wärmeleitgrade) zeigte NTE-Na 3 eine 75 9d-ige Kesselateinverhütung. Andererseits war die Leistung des ÄDTE-Na. in einer Menge von 54 T/M bei 7 560 kcal 9,29 dm 2/Stunde (30 000 BTU sq.ft./hr) 75 % und überraschenderweise 0 96 bei 22 680 kcal 9,29 dm 2/ Stunde (90 000 BTU sq.ft./hr) oder keine Verbesserung gegenüber der Blindprobe. Example 5 In a surprising series of experiments, the effect of the deviation in the degree of thermal conductivity in relation to the effects of NTE-Na 3 and ÄDTE-Na4 was determined. The make-up water was diluted Chicago tap water containing 5 T / M Ca and 2 T / M Mg which was pressurized to 800 psi according to the test described above. NTE showed both at 7,560 kcal 9.29 dm2 / hour (30,000 BTU sq.ft./hr) and at 22,680 kcal 9.29 dm2 / hour (90,000 BTU sq.ft./hr) (degrees of thermal conductivity) -Na 3 a 75 9d-ige cauldron prevention. On the other hand, the performance of the ÄDTE-Na. in an amount of 54 T / M at 7,560 kcal 9.29 dm 2 / hour (30,000 BTU sq.ft./hr) 75 % and surprisingly 0 96 at 22,680 kcal 9.29 dm 2 / hour (90,000 BTU sq.ft./hr) or no improvement over the blank sample.
Das NTE-Na 3-Salz und andere erfindungsgemäss verwendete Salze zeigten nicht nur eine ausgezeichnete Wirkung als Kesseladditive, sondern es trat auch kein Problem durch Schäumen auf. Nicht einmal eine Menge von 1 000 T/M an NTE-Na3 im Kesselwasser steigerte die Schaumbildung bemerkenswert, auch wenn kein Antischaummittel vorhanden war.The NTE-Na 3 salt and other salts used in the present invention showed Not only did it have an excellent effect as a boiler additive, but it also did not occur Foaming problem. Not even 1,000 T / M of NTE-Na3 im Boiler water increased foaming remarkably, even if no antifoam agent was used was present.
Im Rahmen der Erfindung können eine Reihe von Abänderungen vorgenommen werden, die den Erfindungsgedanken nicht beeinträchtigen.A number of modifications can be made within the scope of the invention which do not affect the concept of the invention.
Claims (4)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US412336A US3296027A (en) | 1964-11-19 | 1964-11-19 | Removal and inhibition of scale formation in steam generation |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1517473A1 true DE1517473A1 (en) | 1969-12-11 |
Family
ID=23632594
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19651517473 Pending DE1517473A1 (en) | 1964-11-19 | 1965-10-08 | Process for removing scale and preventing scale formation |
Country Status (4)
Country | Link |
---|---|
US (1) | US3296027A (en) |
DE (1) | DE1517473A1 (en) |
ES (1) | ES317585A1 (en) |
GB (1) | GB1059198A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0273182A1 (en) * | 1986-12-01 | 1988-07-06 | Siemens Aktiengesellschaft | Method of cleaning a container |
FR2641370A1 (en) * | 1988-12-29 | 1990-07-06 | Henkel France | PRODUCT FOR CLEANING PLATE EXCHANGERS, IN PARTICULAR IN THE NUCLEAR INDUSTRY, AND METHOD USED IN THE USE OF THIS PRODUCT |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3430641A (en) * | 1966-02-16 | 1969-03-04 | Nalco Chemical Co | Method of redispersing deposits |
US3520813A (en) * | 1966-11-03 | 1970-07-21 | Betz Laboratories | Method and composition for controlling boiler scale formation |
US3549538A (en) * | 1967-06-22 | 1970-12-22 | Nalco Chemical Co | Scale inhibition and removal in steam generation |
US3518204A (en) * | 1967-11-01 | 1970-06-30 | Betz Laboratories | Control of the rate of precipitate growth and of precipitation in aqueous systems |
US3956164A (en) * | 1974-09-23 | 1976-05-11 | Calgon Corporation | Chelating agents |
US4457847B2 (en) * | 1981-11-05 | 1996-12-31 | Nalco Chemical Co | Carboxylate polymers for internal scale control agents in boiler systems |
US4726907A (en) * | 1983-08-10 | 1988-02-23 | Nuclear Technology Corp | Hydrazides of amino-polyacetic acids as chelants |
US4775491A (en) * | 1983-08-10 | 1988-10-04 | Nuclear Technology Corp. | Hydrazides of amino-polyacetic acids as chelants |
US4708805A (en) * | 1986-11-24 | 1987-11-24 | Muhala Thomas F D | Barium sulfate removal and anti-deposition compositions and process of use therefor |
US5276965A (en) * | 1992-02-13 | 1994-01-11 | The Atlantic Group, Inc. | Method for dismantling potentially contaminated tubes from a tube bundle |
US20120006671A1 (en) * | 2010-07-07 | 2012-01-12 | General Electric Company | Control of scale formation in produced water evaporators |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2240957A (en) * | 1935-10-30 | 1941-05-06 | Gen Aniline & Film Corp | Process for avoiding and rendering harmless the precipitates of water insoluble metal salts |
USRE23085E (en) * | 1940-04-22 | 1949-02-22 | Prevention of foamtttg in steam | |
US2396938A (en) * | 1944-01-22 | 1946-03-19 | Martin Dennis Company | Method of treating boilers |
GB873488A (en) * | 1956-12-19 | 1961-07-26 | Benckiser Gmbh Joh A | A method for counteracting the formation of precipitates and discolourations and forsequestering iron in an aqueous medium containing iron |
US3099521A (en) * | 1960-10-03 | 1963-07-30 | Dow Chemical Co | Water treatment |
DE1222444B (en) * | 1961-10-13 | 1966-08-04 | Bayer Ag | Procedure to prevent stone deposits and corrosion |
-
1964
- 1964-11-19 US US412336A patent/US3296027A/en not_active Expired - Lifetime
-
1965
- 1965-09-06 GB GB38058/65A patent/GB1059198A/en not_active Expired
- 1965-09-18 ES ES0317585A patent/ES317585A1/en not_active Expired
- 1965-10-08 DE DE19651517473 patent/DE1517473A1/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0273182A1 (en) * | 1986-12-01 | 1988-07-06 | Siemens Aktiengesellschaft | Method of cleaning a container |
FR2641370A1 (en) * | 1988-12-29 | 1990-07-06 | Henkel France | PRODUCT FOR CLEANING PLATE EXCHANGERS, IN PARTICULAR IN THE NUCLEAR INDUSTRY, AND METHOD USED IN THE USE OF THIS PRODUCT |
EP0378013A2 (en) * | 1988-12-29 | 1990-07-18 | Henkel France S.A. | Product for cleaning plate exchangers, especially in the nuclear industry, and process using this product |
EP0378013A3 (en) * | 1988-12-29 | 1991-10-16 | Henkel France S.A. | Product for cleaning plate exchangers, especially in the nuclear industry, and process using this product |
Also Published As
Publication number | Publication date |
---|---|
GB1059198A (en) | 1967-02-15 |
US3296027A (en) | 1967-01-03 |
ES317585A1 (en) | 1966-04-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
SH | Request for examination between 03.10.1968 and 22.04.1971 |